Survivors of Bergen-Belsen, near Hanover in northern Germany, held private ceremonies on Friday to mark their liberation by British troops on 15 April 1945.
Edith and Renee were taken to Auschwitz, then to German labour camps and eventually the Belsen concentration camp, where they were when it was liberated by British forces in 1945.
Only 12 when she was liberated from Bergen-Belsen, she bore the identification number from the concentration camp, tattooed on her arm in blue ink, for the rest of her life.